ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The temperature dependence of the integrated X-ray diffracted intensities in sodium metal has been determined for the 222, 400, 330, 411 and 332 reflexions in the temperature range 148 K to the melting point of 371 K. In the temperature range 148 K to about 300 K, all the data can be fitted using a quasi-harmonic approximation for the temperature factor. From room temperature to the melting point the intensities for all the reflexions were observed to decrease rapidly with temperature, and could not be fitted either with a quasi-harmonic or fourth-order anharmonic model for the temperature factor. There is no evidence for anisotropy in the intensities below room temperature, but from 293 K to the melting point, anisotropy increases rapidly. A qualitative explanation of the high-temperature phenomena in terms of a lattice relaxation around the vacancies has been advanced.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739476000697
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